Location

San Diego, California

Session Start Date

5-24-2010

Session End Date

5-29-2010

Abstract

The Las Colinas landslide that occurred at Santa Tecla (El Salvador, Central America) due to the earthquake of 13 January 2001 is considered as one of the most destructive landslides ever known. This paper studies the ability of Hill’s sufficient condition of stability (1958), which is based on the sign of second-order work, for predicting and describing this catastrophic massive landslide. The general expressions of both local and global second-order work criteria and its implementation into finite element codes are given. By using the non-associated elasto-plastic Hardening Soil Model and the local second-order work criterion, it is demonstrated that potentially unstable stress-strain states can occur strictly inside the Mohr-Coulomb failure surface in axisymmetric conditions. The Las Colinas landslide under earthquake shaking is simulated in plane strain conditions, using the pseudo-static method as loading variable with the non-associated Hardening Soil Model available in the finite element code PLAXIS. The location of the zone of negative values of the local second-order work makes it possible to successfully exhibit the landslides mechanism observed on the Las Colinas slope. Moreover, the comparison with the safety factors calculated by using the methods of slices and the shear strength reduction technique confirms that the global second-order work is a more pertinent indicator for predicting the global stability of the Las Colinas slope.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Meeting Name

Fifth Conference

Publisher

Missouri University of Science and Technology

Publication Date

5-24-2010

Document Version

Final Version

Rights

© 2010 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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May 24th, 12:00 AM May 29th, 12:00 AM

Finite Element Modeling of the Las Colinas Landslide Under Earthquake Shaking

San Diego, California

The Las Colinas landslide that occurred at Santa Tecla (El Salvador, Central America) due to the earthquake of 13 January 2001 is considered as one of the most destructive landslides ever known. This paper studies the ability of Hill’s sufficient condition of stability (1958), which is based on the sign of second-order work, for predicting and describing this catastrophic massive landslide. The general expressions of both local and global second-order work criteria and its implementation into finite element codes are given. By using the non-associated elasto-plastic Hardening Soil Model and the local second-order work criterion, it is demonstrated that potentially unstable stress-strain states can occur strictly inside the Mohr-Coulomb failure surface in axisymmetric conditions. The Las Colinas landslide under earthquake shaking is simulated in plane strain conditions, using the pseudo-static method as loading variable with the non-associated Hardening Soil Model available in the finite element code PLAXIS. The location of the zone of negative values of the local second-order work makes it possible to successfully exhibit the landslides mechanism observed on the Las Colinas slope. Moreover, the comparison with the safety factors calculated by using the methods of slices and the shear strength reduction technique confirms that the global second-order work is a more pertinent indicator for predicting the global stability of the Las Colinas slope.